Prime pagine RA2010FUS:Copia di Layout 1 - ENEA - Fusione

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120 progress report 2010 Figure 9.5 – LOFT, with the detectors folded, in the ogive of the launcher detectors) in the 2–30 keV range (fig. 9.4). The achievable time–resolution of its x–ray observations of compact objects would constitute a relevant diagnostic for strong–field gravity and the equation of state of ultra dense matter. LOFT has been presented in December 2010; to date it has been selected (with other 13, out of 47 proposals) for further consideration by the Advisory Structure of the ESA Scientific Programme. Figure 9.6 – Elecronic equipment for the RF interferometer for helicon plasma hydrazine Standard deviation (Deg) 20 10 5 3 1 0.5 0.2 0.1 0.05 0.02 10 implementation and is based on an ENEA electronic patent. 9.4 Digital Phase Detector for the RF Interferometer for Mini Helicon Space Thruster Within the HPH.com project a RF interferometer has been built for the mini helicon thruster at the CISAS laboratory (Padua). This interferometer is capable of detecting a phase variation of 0.3° within the band 0–15 kHz, and 0.06° within the band 0-100 Hz. This instrument has been used to detect the density of the plasma generated by the thruster (which is a small cylindrical plasma with 20 mm of diameter) with an error of 4×10 16 m –3 in the band 0–15 kHz, and of 1×10 16 m –3 in the band 0–100 Hz. 20 40 60 80 Attenuation (dB) Figure 9.7 – Total error (including the linearity error) vs attenuation Commercial analog I/Q detectors for phase shift measurements introduce an error not less that 1°, so a dedicated phase detector, with appropriate noise figures (0.02°), has been developed, tested and successfully integrated for the RF interferometer. It is based on a digital elaboration system that implements a vector voltmeter working at the frequency of 100 MHz and measures the complex components of the signal under test as compared The system sends the elaborated data to a PC, via an ethernet port at a speed of 31thousand measurements per second. On the PC a GUI able to start receiving is present, which saves the data and allows for a preview of decimated data. Furthermore, the system shows on a 4–line LCD the value of the module and the phase instantaneously measured. The system calculates the quadrature components, has a fully digital The advantages of this system are high linearity, high measurement frequency and high noise immunity, see figure 9.7.
miscellaneous (cont’d.) progress report 2010 121 References [9.1] S. Tosti, Int. J. Hydrogen Energy 35, 12650–12659 (2010) [9.2] S. Tosti, et al., Dispositivo compatto a membrana metallica per la produzione di fluidi gassosi, Domanda di brevetto per modello di utilità n. RM2010U000066 del 24.04.2010 [9.3] S. Tosti, et al., Asia–Pac. J. Chem. Eng. 5, 207–212 (2010) [9.4] A. Iulianelli, et al., J. Hydrogen Energy 35, 3159–3164 (2010) [9.5] A. Santucci, et al., Oxidative steam reforming of ethanol over a Pt/Al 2 O 3 catalyst in a Pd–based membrane reactor, accepted for publication on Int. J. Hydrogen Energy [9.6] S. Tosti, et al., L. M. Madeira, Catal. Today 156, 107–117 (2010) [9.7] S. Tosti, F. Borgognoni, A. Santucci, Int. J. Hydrogen Energy 35, 11470-11477 (2010) [9.8] S. Tosti, et al., Int. J. Hydrogen Energy 35, 12596–12608 (2010) [9.9] A. Basile, et al., Adv. Sci. Technol. 72, 99–104 (2010) [9.10] A. Pellizzoni, et al., Science 327, 663 (2010) [9.11] M. Marisaldi, et al., J. Geophys. Res. 15, A00E13, (2010) doi:10.1029/2009JA014502 [9.12] ENEA - Unità Tecnica Fusione, Progress Report (2009) [9.13] M. Feroci, et al., LOFT – a Large Observatory For x–ray Timing, Proceedings of SPIE Vol. 7732, Paper No. 7732–66 (2010); arXiv:1008.1009v1 [astro–ph.IM]
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